While watching another anime, I stumbled upon a reference to the Japanese folk story of Momotaro. I discovered this story was connected deeply to the plot of Wano country arc. I will summarise the story:
A small boy was found by two people inside a giant peach in the river. They named him Momotaro (similar to both Momonosuke and Luffytaro). Even when he was little, he was strong enough to cut trees with a kitchen knife. After he matured, Momotaro left to fight a band of demons (onis), that ruled the land from an island called Onigashima. On his way, he used Kibi Dango (Otama's df), to tame a dog (Yamato), a Monkey (Luffy), and a bird (Marco). Together, they defeated the Oni king (Kaido) and his subordinates, and forced him to cut one of his horns. Momotaro became was made a hero when they returned.
What are you thoughts? Can you figure out the parts I couldn't (the symbolisation of the Peach, the river and the parents)?
Here are sources with more info and the full text.
https://en.m.wikipedia.org/wiki/Momotar%C5%8D
https://en.m.wikisource.org/wiki/Story_of_the_Son_of_a_Peach